--- sys/amd64/amd64/pmap.c.orig
+++ sys/amd64/amd64/pmap.c
@@ -2015,8 +2015,7 @@
 
 	if ((cpu_stdext_feature2 & CPUID_STDEXT2_LA57) == 0)
 		return;
-	if (!TUNABLE_INT_FETCH("vm.pmap.la57", &la57))
-		la57 = 1;
+	TUNABLE_INT_FETCH("vm.pmap.la57", &la57);
 	if (!la57)
 		return;
 
